You can stop cabs in front of the H&M .. small section where cabs stop.
Also, many of the cabs will have a "Not for Hire" sign which means that they're either going on a shift change or they're looking for cross harbour fares. If they're parked and have a no hire sign - they're cross harbour Kowloon side taxis.
If you want to go cross harbour (through a tunnel) make a "walk like an Egyptian" type gesture to indicate that you want to go through the cross harbour tunnel.
Now .. practice the gestures and post them up on YouTube so that we can all have a good laugh.
